HEAVY TRAFFIC APPROXIMATION METHODS FOR OPTIMIZING TANDEM MULTISERVER QUEUING SYSTEMS IN ANTENATAL CLINICS - Okechukwu, Ifeoma Chizoba; Oruh, Ben Ifeanyichukwu; Omekara, Chukwuemeka O.; Enogwe, Samuel Ugochukwu (FUDMA Journal of Sciences, 2025)